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Toolik Field Station maintains a continuous GPS base station for use by the Toolik community and the general public. The base station runs continuously year-round with files permanently archived and available for download. Learn more about TLK2 on the NGS NCN Station Pages site: . 

Receiver: Trimble NetR8 Survey Grade w/internal batteries, external power, internal storage, web interface

Receiver Antenna: Trimble Zephyr Geodetic 2 ROHS  (TRM57971.00)

Radio: Pacific Crest RFM96W, 2 watt and 35 watt toggle, Astron 12V 2.5A power supply, broadcast frequency: 464.500MHz, broadcast antenna: Base Omni 5dB

Computer: Dell PowerEdge 2400, Pent III, 1GHz, 1Gb RAM, Linux Fedora

Software: Custom File Conversion Script - UNAVCO

Toolik Field Station provides mobile GPS base stations with radio link for RTK for use by the Toolik community on an as needed basis. The base stations can be set up over known benchmarks or post-processed for base coordinate solution. Additional mobile base stations are made available to TFS during the summer field season by Earthscope (formerly UNAVCO). 

Toolik Field Station provides survey grade field GPS services for registered users, administrators and managers. Accuracies range from greater than 10cm to sub-centimeter depending on distance from base station and field method (see tables below). Applications include but are not limited to: Stream channel morphology, Archiving of research plot locations, Facility / building survey, Localized, fine-scale DEM creation, Long-term glacial and tectonic monitoring, Precise landscape metrics

ToolikGIS provides a range of mapping grade receivers for use by station residents, administrators and managers. Researchers should utilize a GPS unit that is mapping-grade or above to record field sites.  With minimal processing after the user returns from the field, the data can be distributed in a variety of formats including tabular (e.g. excel), GIS (shapefile, coverage), or delimited text. To check out a GPS unit please go to the equipment page on the .  

ToolikGIS provides a high resolution bathymetric unit that we use to collect bathymetric data in lakes, streams and ponds around Toolik Field Station for registered users, administrators and managers. After data processing, ToolikGIS can use this data to create 2D and 3D bathymetric maps for use in field work or publications. Depth range for this unit is reported to be 0.3m - 75m. Resolution of the final product is limited by the extent of data collection - less time on the water requires more interpolation.